Thank you for viewing. The JOYO DYNAMIC COMPRESSOR (Dyna Comp) is a guitar effects pedal with three controls: SUSTAIN, LEVEL, and ATTACK, and features TRUE BYPASS. It's a clean, noise-free, and easy-to-use Dyna Comp with no quirks. Of course, it can also be used for bass. It's in very good condition as it has hardly been used since purchase. The original box shows signs of aging. - Brand: JOYO - Model Name: DYNAMIC COMPRESSOR - Controls: SUSTAIN, LEVEL, ATTACK - Bypass: TRUE BYPASS - Accessories: With box The original box shows signs of aging. Thank you.